Adding active class to router link element as well and cleaned up code.

ignite-router.js

@@ -34,10 +34,8 @@ class RouterLink extends IgniteElement {
     render() {
         return this.template
             .onClick((event) => this.onClick(event))
-            .child(
-                new slot(this)
-                    .class(this.active, (value) => { return value ? "active" : null })
-            );
+            .class(this.active, value => value ? "active" : null)
+            .child(new slot(this).class(this.active, value => value ? "active" : null));
     }
 
     ready() {